Chuck



J. A. OLSON 4May 21,. 1929;

CHUCK Filed May 27. 1922 2 Sheets-Sheet l INVLNTOR.

llllilllllllllllLll ATTORNEY.

Fig 4 J. A. OLSON May 2l, 1929.

CHUCK Filed May 27, 1922 2 Sheets-Sheet 2 n Fig. 2

ATTORNEY."

Patented May 2l, 1929.

UNiTi-:o STATES 1,713,978 PATENT OFFICE.

JOHN A. OLSON, or .CLEvEL1511511),4 OHIO, AssieNoR 'ro s-rMANUFACTURING, COMPANY,

or CLEVELAND, OHIO, A CORPORATION or OHIO.

CHUCK.

Application filed May 27,

This invention relates to chucks, particularly those of theautomatically operated type. y l

One obj ect of the invention is to construct a chuck, ofthe general typeillustratedfin my Patent No..1,455,351, wherein the structure issimplied, and the cost of construction of the. chuck materiallyAdecreasf-)d without sacrificing the advantages possessed by theprevious type.`

Another object is to construct a chuck having means for positivelyactuating the clamping members throughout substantially their entirestroke Without lost motion or back lash and for maintaining the clampingmembers in clamping position while permitting movement of theactuatingmeans.

Another Object is to construct a chuck body having' a central openingand slotsffor Clamping members radiating therefrom and provided withreinforcing means, adjacent to the central opening. p

Another object is to 'provide in a chuck Ahaving a face portion in whichis formed a central opening and slots radiating therefrom, means forstrengthening and reinforcing the face portion, for excluding dirt fromthe interior of the chuck, for furnishing av bearing for the slid-ablemeans for actuating clamping members and va bearing engaged on Oppositesides by the clampingfmembers.

Other Objects will appear and be pointed Out hereinafter. j

In the drawingaccompanying and forming a part of this specification:

Fig. 1 is a front elevation of one form of chuck constructed inaccordance with my invention.

Fig. 2 is a vertical .cross-sectional View taken on line 2 2 of Fig. 1.f

Fig. 3 is aI fragmentary, top plan view taken on line 3-,3 of Fig. 1.

Figs. 4t and orare respectively front and side elevations of the levercarrying member.

Fig. 6 is a diagrammatic representation of the relative positions of thelever and lever actuating member at Veither end strokes, and j Fig. 7 isa front endv elevationof the lever actuating member. y

In the drawings, wherein for purposesk of illustrating my invention Ihave shown one embodiment of my invention, numeral 1 in- :of theirdientes a body member, comprising a circular 1922. Yserieu No. 564,164.

ings 2'? extending from opening 2'c1 toward:

the Outer edge of the face portion 2 for clamping members. At the centerof face portion 2, and about opening 2a is formed an upstanding circularrib 4, provided with a guideway or bearing surface 5. Between rib l andflange 3 are formed substantially parallel Vupstanding ribs 6,preferably Vvarranged in pairs, and equally spaced on yeither, side ofOpenings 2b.

Parallel with the face of portion 2'and arranged radially with respectto the face portion andI opening 2l are a plurality of grooves andtongues 7 and 8 respectively which are adapted toreceive correspondinglyformed clamping members'consisting of jaws 9, and jaw slides 10. Betweenthe meeting faces 11, of the jaws 9, and slides 10, is located anexteriorl'y threaded screw 12, which bears against end abutments inslides 10 and engages with threads on the Yjaws 9, thus operativelysecuring together the members 9 and 10 so that they function y as a unitin the chuck.

Adjustment of the Vscrew serves to move the jaws with respect to theslides 10, and inV this manner to position the jaws to receive workblanks of various sizes the position of slides 10 in the body memberbeing ydependent upony levers 17 later to be described.

On the rear side of body member 1, is

mounted a plurality of segmental lever carrying members, each consistingof a plate 171, and upstanding ribs 15, through which passes a pivot pin16. On the pin 16, and

Ybetween ribs 15, a lever 17 is pivotally slide. 10. A One or moreprojections 19, mayv be provided. and in this modieatien ll have showntwo such'projections, the purpose being to provide an enlarged bearingsurface in contact with the slides 10, Vwhereby the latter may beactuated under varying loads without liability of breakage. The oppositeend of levers 17, are preferably bifurcated having thus formed twoprojections 21a, 21b with a curved .surface intervening. The rear edgeof projection 21a is also relieved substantially as shown, for a purposelater to be described.

Slidably mounted in guideway or bearing 5, in the central rib 4, of bodymember 1, is a cylindrical member 22, having formed on its outer surfacea plurality of projections or cams to engage with the projections 21 and21b of lever 17. This member 22, isadapted to be secured to suitablepower actuating means suoli, for example, as a pneumatic plunger (notshown) and for this purpose is provided with an opening 23, throughwhich a headed bolt 24C, passes and is secured thereto by a nut 25.rlllie projections 26, which are formed by milling cliordal slots orgrooves 27 and 28, on the outer surface of member 22 preferablycorrespond in number to the number of levers in the chuck and are formedat substantially right angles thereto thus affording a broad area ofcontact with the levers. Flach projection or cani 26, is preferablyprovided with a cam surface 26 of vary-- ing curvature merging into asubstantially flat portion 2Gb near the top thereof, and a surface 26"'which may be of varying curvature or otherwise as may be desired. Therear walls of grooves 27 are relieved to correspond with Vthe rear edgeof projection 21n of lever 17, thus permitting a relatively long strokeof members 22, 17, 9 and 10.

As shown, member 22, is hollowed out as at 2)` and a flanged dustbushing 30, is inserted therein and secured to the rear side of faceportion 2 at the inner ends of each part of the face portion between theslots 2b, as by rivets 31. Member 22 preferably has bearing contact onits surface 29 with the exterior surface of bushing 30. This combinationand arrangement of parts not only serves to exclude dirt, turnings,etc., from theinterior of the chuck and Contact therein with the movingchuck partsbut also serves greatly to strengthen the chuck at itscenter. Member BO being secured to the face portion 2 adjacent theopening 2 bridges the radial slots for the clamping members and tends todistribute to the whole face portion 2 any strains imposed at one ormore points thereof, thereby strengthening and rendering the faceportion substantially rigid. Additional strength and rigidity isconferred on the face portion 2 by the close litt-ing contact of themember 22 in body member 1 and about member 30 since strains tending todistort the face portion 2 will be transmitted through member 22 to andresisted by the entire body member.

The several clamping members preferably have bearing engagement at alltimes with the front and rear surfaces of the flange 32 ofV member 30,the flange extending into the clamping members throughout substantially.the entire stroke of the members as shown in Fig. 2. In the forni ofmembers herein shown. the opening in the clamping member for receptionof flange 32 lies between the members 9 and 10. I Inasmucli as member 10has its meeting face 11 bored to receive screw 12, and therefore wouldpresent a relatively small bearing area for contact with flange 32, afiller plate 33 is scoured near the inner end of the slide member, asshown in Fig. 2, and engages over an enlarged area with the flange.

|The operation of my improved chuck is substantially as follows: Afterthe jaws 9, have been adjusted to the work blank which is to be heldthereby, as may be done by turn ing screws 12, the power operating meansis applied to cylindrical member 22, through bolt 2e, `thus causing themember to move rearwardly in the chuck. The levers 17 pivot about pin16, due to the engagement of the projections 21 and 21b thereofwith-cams 26 on the cylindrical member 22, teeth i9` on the opposite endof lever 17 actuating the clamping member comprising jaw slides 10 andjaws 9 toward the clamping position. As

member 22, continues to move rearwardly the Sli rear aro'ection 21n onlever 17 moves u on the surface 26, the rate of mpvement of the levercontinually decreasing, ydue to the decreasing pitch of the cam, untilthe projection 21a, reaches the flattened surface 2Gb. These relativepositions are shown clearly in Fig. 6. After projection 21, of lever 17has reached the flattened portion vof projections 2G, no furthermovement of the lever rcsultsuntil the member 22, has moved anadditional distance and projection 21a comes into contact with the topof projections 26. It will be evident that the levers 17, are heldstationary or locked in position by the flattened surface 2Gb of cams26, since, to effect a movement of the levers in the opposite directiondue to back lash by the aws 9, forward movement of member 22, isnecessary. As will appear from reference to Fig. 6 where movement oflever 17 from a dotted line position into the solid line position isshown, movement of the levers out of clamping position results inradially inward movement of projections 21a and in gripping member 22therebetween unless the latter is suitably moved. By reason of theflattened surface on cam 26, member 2,2, is permitted to move rearwardlyan additional distance independently of levers 17, while the latter areheld stationary or in clamping position. The approximate extent of suchmovement of member 22, independent of lever 17', is illustrated indotted lines in Fig. 6,

where the front projection 21b is spaced from a cam 26. Before levers 17are actuated out toA engage front projection 21a'.

Obviously the clamping. members hereiny shown as consisting of members 9and 10 may be formed.` as a sin le element.

It will be seen romlfthe drawings; and the foregoing description thattlieprojections 21ar and 211 engage witlrboth. the opposite sur-`r faces2Ga and 26 ofthe projection 26 through# out substantially they entirestroke of the clamping members, the projection 2lb being out of contactwith surfacel 26.C only when the clamping members are-'in clampingconadition. In this manner I avoid all lost mo-y tion between the' lever17 and member 22 which could result in relative movement o the parts dueto back lash. e

Having thus described my invention in detail and shown one practicalembodiment thereof so that those skilled in the art may be enabled topractice the invention, What I desire to secure by Letters Patent isdefined in what is claimed, it being understoody that variousmodifications ofthe herein-described parts may be made Without departingfrom the spirit of my invention.v

What is claimed is:

l. In a chuck, in combination, a body member having a peripheral flange,a centrally7 arranged rib having a g-uideway formed therein, pairs of'ribs integral With the saidv peripherall flangevand the said centralrib, clamping members slidably mounted in the body member, a segmentalplate provided with parallel flanges and secu-red to each pair of ribs,a lever pivoted between the flanges on each plate, and engaging with theclamping members, and a cylindrical member slidably mounted in the saidguideway and adapted to actuate the said levers and clamping members. Y

2. In a chuck in combination, a body member having a central guideWay,radially arranged clamping members 'slidably mounted to reciprocate inthe said body, levers engaging with the said clamping members to actuate the latter into and outkof Work clamping position and to lock thesaid clamping members in Work clamping position, a cylindrical memberreciprocably mounted in the said guideway and having a plurality ofexterior chordal projections each provided with oppositely disposedcurved sides and a fiat top surface therebetween, the said levers eachengaging both curved side surfaces of their respective projectionsthroughout substantially the entire stroke of the clamping members andengaging With the said flat surface when the clamping members aresubstantially stationary in clamping position.

3. In a chuck, in combination, a body member khaving a plurality ofclamping members and a cylindrical member slidably mounted therein, aplurality of lever carryin vmembers removably secured to the said bo ymem'- ber eachk comprising a segmental platehaving upstandingsubstantially parallel ribs, a level pivotally'mounted between theribsof each of` the-,said leverk carrying members, the

, levers operatively engagingat one end with the said cylindrical memberand at the other end with the said clamping members.

el. In a chucln'iny combination, a` body mem,- bercomprising a faceportion having rearwardly extendingribs and flanges? formingcavitieso'pento the rear of the face portion, plates forming closuresfor certain of the said cavities, ribseon each of the said plates, alever pivoted between the said ribs of each plate, jawy slides inthebody member and a reciprocable member mounted centrally of thev bodymember, the said levers each opery atively engaging a jaw slide; at oneend and the reciprocable member at the other end.

5. In a chuck, lin combination, a bodymember, a plurality of unitsremovably secured thereto,each unit comprising a plate provided withribs, a pivot pin mounted inthe ribs and a lever pivoted between theribs on they said pin, jaw slides and jaws cach engaging one end of alever and an actuating member engaging the other end of each lever.

In a chuck in combination, a. body member provided with a face portionhaving radial'slots intersecting with a central openingya tubular memberhaving a flange at one end, the said flange engaging the rear side ofthe face portions adjacent 'to the central opening and bridging A,theradialslots, the said flange being secured directly to the inner endofeacli segmental pai-tof the face y portion between the slots by meanspassing throughv `the said face` .portions and flange clamping memberslslidable in the slots and engaging opposite sides of the said flangevthroughout substantially their entire stroke, an annular bearing Wallspaced apart from the outer surface ofthe said tubular member, aslidable cylindrical member having close fitting engagementsimultaneously With the said lannular Wall and the said tubular memberand means engaging the cylindrical member to reciprocate the saidclamping members.

7. In a chuck in combination, a chuck body comprising a disc like facehaving a peripheral flange, the said face having a central openingtherethrough and slots therethrough radiating from the central openingtoward the outer edge of the face, an annular reinforcing memberengaging the rear side of the face adjacent to the central opening,bridging the said slots and secured directly to the inner ends of eachof the segmental portions of the face between the slots by securingmeans passing through the said face and reinforcing member, clampingmembers mounted to reciprocate in each of the said slots, the saidclamping members engaging both the front and'the rear surfaces of theciprocating the said clamping members.

8. In a chuck 1n combination, a chuck body lcomprising a disc. like tacehaving a periph-v eral flange, the tace having a central openingtherethrough and slots therethrough radiating from the central openingto the outer edge of the face, a tubular bushing "within the chuck bodyhaving an outer bearing surface and a reinforcing end flange, the saidflange engaging the rear side of the said face, bridging the said slotsand being secured directly to the inner end of each of the segmentalportions of the face between the slots by rivets passing through thesaid face and the flange of the bushing, clamping members mounted toreciprocate in each of the said slots and engaging with both the frontand rear surfaces of the said annular member throughout substantiallytheir entire stroke, a cylindrical member having close fittingengagement with the outer bearing surface of the said bushing, and meansengaging the cylindrical member and the clamping members to reciprocatethe latter when the former is moved.

9. In a chuck in combination, a body member having a disc like faceprovided with a central opening and slots radiating therefrom, spacedcircular flanges integral with the face adjacent to the central openingand to the periphery of the face, substantially parallel webs arrangedin pairs and integral with the said Jface and flanges, clamping membersslidable in the said slots, a lever engaging each clamping member toactuate the samea plurality of lever carrying members each secured toapai'r of said ribs Vandl pivotally supporting a lever between the ribs,and means for actuating the levers.

10.l In a chuck in combination, comprising a face portion having acentral opening, slots radiating from the central opening and spacedinner and outer annular flanges on one side of the face portion disposedadjaf cent to the' inner and outer peripheries, a reinforcing annularmember secured directly to the segmental -tace portions defined by theradiating Yslots by members passing through the said tace portions andreinforcing member at a plurality of points adjacent to the centralopening and spaced apart from the said inner flange, substantiallyparallel webs on opposite sides of each of said slotsrintegral withv theface portion and the said flanges, clamping members slidable in theslots and means between the said webs for actuating the said clampingmembers.

ll. The combination of a body having radially arranged guide ways,slides in said guide ways, jaws secured `to said slides, bell cranklevers lnountedin the body and engaging with said slides, one arm ofeach of said levers projecting inwardly and having oppositely disposedcam faces, a slidable member havingvprojections for engagement with saidinner ends of the levers lor actuating Vthe same, means for preventinglost motion between the projections and cams, and means forreciprocating said slidable member. c f

In testimony whereof, I hereunto ailix my, signature.v

JOHN A. OLSON.

